#封装一个MyMath类，实现加/减/乘/除
class MyMath(object):
    @staticmethod
    def add(a, b):
        return a + b

    @staticmethod
    def less(a, b):
        return a - b

    @staticmethod
    def mult(a, b):
        return a * b

    @staticmethod
    def exce(a, b):
        return a / b

if __name__ == '__main__':
    a, b = input("please input a,b: ").split(',')
    print(f"a + b: {MyMath.add(int(a), int(b))}")
    print(f"a - b: {MyMath.less(int(a), int(b))}")
    print(f"a * b: {MyMath.mult(int(a), int(b))}")
    print(f"a / b: {MyMath.exce(int(a), int(b))}")